720701831 has 2 divisors, whose sum is σ = 720701832. Its totient is φ = 720701830.

The previous prime is 720701819. The next prime is 720701833. The reversal of 720701831 is 138107027.

720701831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720701831 is a prime.

It is a super-2 number, since 2×720701831² = 1038822258413505122, which contains 22 as substring.

Together with 720701833, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 720701794 and 720701803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720701833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360350915 + 360350916.

It is an arithmetic number, because the mean of its divisors is an integer number (360350916).

Almost surely, 2^720701831 is an apocalyptic number.

720701831 is a deficient number, since it is larger than the sum of its proper divisors (1).

720701831 is an equidigital number, since it uses as much as digits as its factorization.

720701831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 720701831 is about 26845.8903931309. The cubic root of 720701831 is about 896.5720759214.

Adding to 720701831 its reverse (138107027), we get a palindrome (858808858).

The spelling of 720701831 in words is "seven hundred twenty million, seven hundred one thousand, eight hundred thirty-one".